1 ;;;; backend-library.scm -- helpers for the backends.
3 ;;;; source file of the GNU LilyPond music typesetter
5 ;;;; (c) 2005--2008 Jan Nieuwenhuizen <janneke@gnu.org>
6 ;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
8 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
11 (define-public (ly:system command . rest)
13 (dev-null "/dev/null")
14 (silenced (if (or (ly:get-option 'verbose)
15 (not (access? dev-null W_OK)))
17 (format #f "~a > ~a 2>&1 " command dev-null))))
18 (if (ly:get-option 'verbose)
19 (ly:message (_ "Invoking `~a'...") command))
23 (system-with-env silenced (car rest))
28 (ly:message (_ "`~a' failed (~a)") command status)
30 ;; hmmm. what's the best failure option?
31 (throw 'ly-file-failed)))))
33 (define-public (system-with-env cmd env)
35 "Execute CMD in fork, with ENV (a list of strings) as the environment"
37 ;; laziness: should use execle?
39 ((pid (primitive-fork)))
47 (cdr (waitpid pid)))))
49 (define-public (sanitize-command-option str)
50 "Kill dubious shell quoting"
54 (regexp-substitute/global #f "[^-_ 0-9,.a-zA-Z'\"\\]" str 'pre 'post)
57 (define-public (search-executable names)
58 (define (helper path lst)
61 (if (search-path path (car lst)) (car lst)
62 (helper path (cdr lst)))))
64 (let ((path (parse-path (getenv "PATH"))))
67 (define-public (search-gs)
69 ;; must be sure that we don't catch stuff from old GUBs.
70 (search-executable '("gs")))
72 (define-public (postscript->pdf paper-width paper-height name)
73 (let* ((pdf-name (string-append
74 (dir-basename name ".ps" ".eps")
76 (is-eps (string-match "\\.eps$" name))
77 (paper-size-string (if is-eps
79 (ly:format "-dDEVICEWIDTHPOINTS=~$ \
80 -dDEVICEHEIGHTPOINTS=~$ "
81 paper-width paper-height )))
83 (cmd (simple-format #f
88 -dCompatibilityLevel=1.4 \
98 (if (ly:get-option 'verbose) "" "-q")
99 (if (or (ly:get-option 'gs-load-fonts)
100 (ly:get-option 'gs-load-lily-fonts))
107 ;; The wrapper on windows cannot handle `=' signs,
108 ;; gs has a workaround with #.
109 (if (eq? PLATFORM 'windows)
111 (set! cmd (string-regexp-substitute "=" "#" cmd))
112 (set! cmd (string-regexp-substitute "-dSAFER " "" cmd))
113 (if (access? pdf-name W_OK)
114 (delete-file pdf-name))))
116 (ly:message (_ "Converting to `~a'...") pdf-name)
120 (use-modules (scm ps-to-png))
122 (define-public (postscript->png resolution paper-width paper-height name)
123 (let* ((verbose (ly:get-option 'verbose))
126 ;; Do not try to guess the name of the png file,
127 ;; GS produces PNG files like BASE-page%d.png.
128 (ly:message (_ "Converting to ~a...") "PNG")
130 #:resolution resolution
131 #:page-width paper-width
132 #:page-height paper-height
133 #:rename-page-1 rename-page-1
135 #:anti-alias-factor (ly:get-option 'anti-alias-factor)
136 #:pixmap-format (ly:get-option 'pixmap-format))
139 (define-public (postprocess-output paper-book module filename formats)
140 (let* ((completed (completize-formats formats))
141 (base (string-regexp-substitute "\\.[a-z]+$" "" filename))
142 (intermediate (remove (lambda (x) (member x formats)) completed)))
144 (for-each (lambda (f)
145 ((eval (string->symbol (format "convert-to-~a" f))
146 module) paper-book filename)) completed)
147 (if (ly:get-option 'delete-intermediate-files)
148 (for-each (lambda (f)
149 (delete-file (string-append base "." f))) intermediate))))
151 (define-public (completize-formats formats)
152 (define new-fmts '())
153 (if (member "png" formats)
154 (set! formats (cons "ps" formats)))
155 (if (member "pdf" formats)
156 (set! formats (cons "ps" formats)))
157 (for-each (lambda (x)
158 (if (member x formats) (set! new-fmts (cons x new-fmts))))
160 (uniq-list (reverse new-fmts)))
162 (define (header-to-file file-name key value)
163 (set! key (symbol->string key))
164 (if (not (equal? "-" file-name))
165 (set! file-name (string-append file-name "." key)))
166 (ly:message (_ "Writing header field `~a' to `~a'...")
168 (if (equal? "-" file-name) "<stdout>" file-name))
169 (if (equal? file-name "-")
171 (let ((port (open-file file-name "w")))
178 (define-public (output-scopes scopes fields basename)
179 (define (output-scope scope)
184 (let ((val (if (variable-bound? var) (variable-ref var) "")))
185 (if (and (memq sym fields) (string? val))
186 (header-to-file basename sym val))
189 (apply string-append (map output-scope scopes)))